> ## Documentation Index
> Fetch the complete documentation index at: https://docs.topk.io/llms.txt
> Use this file to discover all available pages before exploring further.

# topk-js/query_agg

[topk-js](/sdk/topk-js/index) / query\_agg

## Functions

### avg()

```ts theme={null}
function avg(field: string): AggregateExpression;
```

Calculate the average value of the given field.

**Parameters**

| Parameter | Type     |
| --------- | -------- |
| `field`   | `string` |

**Returns**

[`AggregateExpression`](/sdk/topk-js/Namespace.query#aggregateexpression)

***

### count()

```ts theme={null}
function count(field?: string): AggregateExpression;
```

Count the number of non-null values for the given field.
If not provided, count the number of rows in the input.

**Parameters**

| Parameter | Type     |
| --------- | -------- |
| `field?`  | `string` |

**Returns**

[`AggregateExpression`](/sdk/topk-js/Namespace.query#aggregateexpression)

***

### max()

```ts theme={null}
function max(field: string): AggregateExpression;
```

Find the maximum value of the given field.

**Parameters**

| Parameter | Type     |
| --------- | -------- |
| `field`   | `string` |

**Returns**

[`AggregateExpression`](/sdk/topk-js/Namespace.query#aggregateexpression)

***

### min()

```ts theme={null}
function min(field: string): AggregateExpression;
```

Find the minimum value of the given field.

**Parameters**

| Parameter | Type     |
| --------- | -------- |
| `field`   | `string` |

**Returns**

[`AggregateExpression`](/sdk/topk-js/Namespace.query#aggregateexpression)

***

### sum()

```ts theme={null}
function sum(field: string): AggregateExpression;
```

Sum the values of the given field.

**Parameters**

| Parameter | Type     |
| --------- | -------- |
| `field`   | `string` |

**Returns**

[`AggregateExpression`](/sdk/topk-js/Namespace.query#aggregateexpression)